ntp

Using VB.NET to query NTP Servers

由 泄露秘密 提交于 2019-12-11 05:27:49
问题 As the title describes I am looking for a way to query for the UTC time from NTP/SNTP Servers from 'VB.NET'. The only libraries I have found for VB.NET to such tasks appear require a fairly large sum of different forms of currency. Any suggestions, comments, methods, or links? Thanks! 回答1: See How to Query an NTP Server using C#? . Not marking as a duplicate, as the solution linked to is in C#, and you asked for VB.NET. However, this can be compiled into a library, and still used within a VB

Replace busybox ntpd with ntp from meta-openembedded

由 ぃ、小莉子 提交于 2019-12-11 02:48:21
问题 I would like to replace the standard ntpd that comes with busybox with the full NTP server released in meta-openembedded. However, I can't find the configuration or Yocto variable that sets that this version of the busybox should not have ntpd . What is the efficient way to do this? Keep in mind that I can't edit the released Poky layer. 回答1: The way I solved is quite simple. There was a file in my layer called busybox/files/ntpd.cfg with a flag CONFIG_NTPD . I've just set it to n and busybox

Get notified of ntp adjustments

由 喜你入骨 提交于 2019-12-11 02:44:23
问题 I am in a weird situation and I need some direction with NTP time adjustments. I have a PC (Red Hat) that runs NTP daemon and this PC adjusts its time with a Stratum 2 time server on my LAN. My PC is also connected to a DVR over serial port (RS-232). This device and my PC time needs to in synchronization. However after some time the clocks of my PC and DVR begin to drift away, so I need a way of detecting time adjustment on my PC and apply same adjustment to DVR as well. Is there any way of

How to can I implement one way latency measurment using C#?

由 梦想的初衷 提交于 2019-12-11 00:31:53
问题 I need to measure a one direction latency measurement between two applications that communicate thru a LAN and report the result to a data collection server. The client application sends the data using multicast, then it passes thru two servers and the last server is the end point of this test, like so: Agent -> multicast cloud -> server 1 -> server 2 I thought about using NTP (or PTP for LAN) to synchronize "agent" and "server 2", but I wonder what's the right algorithm to implement this and

Device starting instruction seconds after other despite NTP offset usage

由 别来无恙 提交于 2019-12-10 20:38:02
问题 Background: I have two physical devices, a Galaxy S3 (phone) and an Asus 700T (tablet) that I want to execute the same set of instructions at the exact same time. As such, I'm using Android's Platform Frameworks Base SNTP client code to instantiate a SNTP client which gets the atomic time, calculates an offset based off the system time, and adds the positive/negative offset to the instruction execution timestamp so that it runs at the exact same time (within a few milliseconds) across all

Why ntpd service is not started automatically after reboot? [closed]

由 拟墨画扇 提交于 2019-12-10 19:57:51
问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . After I installed ntpd via yum I run the command systemctl enable ntpd.service and rebooted the computer. After I got the shell prompt I run systemctl -a | grep ntp and I got ntpd.service loaded inactive dead . If I start it manually using systemctl start ntpd.service it works fine. Why is that? How can I ensure

How to convert NTP time to Unix Epoch time in C language (Linux)

由 試著忘記壹切 提交于 2019-12-10 15:54:15
问题 I have been trying for several months to create a simple SNTP single Client/Server based on RFC5905. Finally I manage to make it work at least I think it works correctly, but when I tried to test my code against a real NTP server (e.g. 0.se.pool.ntp.org:123) the timestamps that I am receiving need to be recalculated. I have tried several different approaches but no matter for 3 days now but no matter what I tried nothing yet. Does anybody know how to convert the NTP timestamp to Unix epoch

NTP Request Packet

由 廉价感情. 提交于 2019-12-10 14:14:46
问题 I'm trying to figure out what I need to send (client) in the NTP request package to retrieve a NTP package from the server. I'm working with the LWIP on Cortex M3, Stellaris LM3S6965 I understand that I will recieve a UDP header and then the NTP protocol with the different timestamps the remove the latency. I probable need to make an UDP header but what do I need to add as data? wireshark image: I hope you guys can help me. 回答1: The client request packet is the same as the server reply packet

NTP and Chrony在RHEL

由 巧了我就是萌 提交于 2019-12-10 11:58:45
在RHEL7上，Chrony已经代替了NTP来做时间同步服务。 1 服务器上操作 yum -y install chrony vim /etc/chrony.conf # Allow NTP client access from local network. allow 10.0.100.0/24 （放开此行，并修改ip） systemctl enable chronyd.service systemctl start chronyd.service 2 客户端操作 yum -y install chrony vim /etc/chrony.conf 注释掉下面四个，加增一个内部时间同步服务器地址 #server 0.centos.pool.ntp.org iburst #server 1.centos.pool.ntp.org iburst #server 2.centos.pool.ntp.org iburst #server 3.centos.pool.ntp.org iburst server 10.0.100.41 iburst systemctl enable chronyd.service systemctl start chronyd.service 来源： https://www.cnblogs.com/ppju/p/12015642.html

ntp时间同步服务

由 陌路散爱 提交于 2019-12-10 01:59:52
1、同步机器时间 Atomic Clock: 现在计算时间最准确的是使用 原子震荡周期 所计算的物理时钟(Atomic Clock),因此也被定义为标准时间(International Atomic Time) UTC(coordinated Universal Time): 协和标准时间 就是利用 Atomic Clock 为基准定义出来的正确时间（世界统一时间，世界标准时间，国际协调时间。 什么是硬件时钟： 硬件时钟: 硬件时钟是指嵌在主板上的特殊的电路, 它的存在就是平时我们关机之后还可以计算时间的原因 什么是系统时钟： 系统时钟: 就是操作系统的kernel所用来计算时间的时钟. 它从1970年1月1日00:00:00 UTC时间到目前为止秒数总和的值 1.安装ntp服务 yum install -y ntp #安装时间服务 ntpdate cn.pool.ntp.org #同步时间命令 # Use public servers from the pool.ntp.org project # Please consider joining the pool (http://www.pool.ntp.org/join.html). server 1.cn.pool.ntp.org server 2.cn.pool.ntp.org prefer vi /etc/ntp.conf
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